Breadcrumb Home > Dictionary > Index D drilling: Meaning and Definition of Find definitions for: drill•ing Pronunciation: (dril'ing), [key] — n. the act of a person or thing that drills. drill•ing Pronunciation: (dril'ing), [key] — n. drill. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: drilling (Thesaurus) drill corps drilling mud ✖ Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language